School Me On Rb20Det Turbo Upgrades

[INDEEP]

I need help! I know lots about these:

And nothing about these:

Fortunately for me, I have one of both of these, the latter of which needs to be messed with!

I'm in the process of shoe-horning an RB20DET into a 1976 Triumph 2500 Mk II in order to make the Worlds most-unattractive (yet highly successful) sleeper.

The RB20DET I purchased (ex SSS Automotive) is a near perfect extremely low-km example that is completely void of any signs of modification (a blank canvas if you will).

Just to fit it all under the bonnet I'm going to need to fit a Jun style plenum (as the OEM unit is too tall), and naturally the conversion requires me to fit an after-market intercooler (460x300x76 fits nicely), and exhaust (3" of course).

Being it will be a sleeper of sorts, it may as well make decent power too. So I'm looking at upgrading the turbo, injectors, and ECU as well.

The injectors and ECU I'm going to leave up to my tuner, but for the turbo, I'd like to get as much feedback as I can before I start pricing them up. The car will basically be a part-time work and back runner and for a bit of fun on the weekend at track days/hillclimbs (which means I'll probably go the route of a 2-stage tune with variable boost to save on fuel when using it to commute).

So what does everyone run on their RB20DETs? What's the *fuel consumption like? And what do you mainly use your car for? My goal is 200kW+ atw when running the good tune. Which should still see my 1250kg Triumph running around nearly as economical as it did with the old 2.5L twin-SU equipped inline six it came out of the factory with.

* Fuel consumption has never really been a concern of mine. As you can't go quick without putting plenty of fuel through, but a $1.60+ for BP Ultimate? WTF??

Edited March 17, 2011 by INDEEP

[paulr33]

for the rb20det with the std manifold etc in place go for a highflowed rb20 turbo

good power, great factory response and steel components brand new vs 20yr old+ ceramics

for ecu check out nistune for a remap option

for stand alone check out vipec, powerfc

for injectors look at GTR injectors

for plenum look at greddy legit plenum or jun, try to avoid ebay copies

with a good tune and you driving it NORMALLY you can get 400kms to a tank

if you flog it non stop on boost expect 250kms to a tank or less

[R31Nismoid]

School yourself - read the RB20 dyno results thread.

[SimonR32]

A second hand RB25 turbo will come very close to 200rwkw with decent response and cheap to boot

Otherwise a HKS GT2530 is the way to go, although you will have to find one second hand which is not always that easy!

[SimonR32]

for the rb20det with the std manifold etc in place go for a highflowed rb20 turbo

good power, great factory response and steel components brand new vs 20yr old+ ceramics

for ecu check out nistune for a remap option

for stand alone check out vipec, powerfc

for injectors look at GTR injectors

for plenum look at greddy legit plenum or jun, try to avoid ebay copies

with a good tune and you driving it NORMALLY you can get 400kms to a tank

if you flog it non stop on boost expect 250kms to a tank or less

Not the biggest fan of highflows on RB20's because they are usually too laggy for the power.

Because RB20 heads are different, both the greddy and jun genuine or copy plenums do not fit... There are a few other options but they are all fairly expensive!

[Simon-S14]

I drove an Rb20 with a HKS 2510 and it was one of the most fun packages ever.. sure it didnt have huge peak power but it was so responsive and stacks of midrange! perfect turbo for street/track duties. 2530 is as big as i would go on a 20

[lachlanw]

a neo turbo will make 200kw easy / will reach 14 psi by 4000 rpm . cheap too . sounds like what id do for your situation . a r33 turbo should reach full boost a bit earlier

example of cheapness http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Nissan/Engines/auction-360675492.htm

[INDEEP]

School yourself - read the RB20 dyno results thread.

I found that after I posted. Great resource!

I especially liked all the: "It would've made more power but a fly landed on the dyno, which affected the balance of my fluffy dice and the figures got botched" type excuses.

Edited March 17, 2011 by INDEEP

[femno]

a neo turbo

No dont do this....it will be laggy as FCK! Terrible combination.

HKS 2530...should be able to pick up a s/h kit for ~$1500. A little pricey but its the best solution IMO for 200-220kw. Itll be the most responsive.

Oh, and dont forget cams gears.....20's LOVE them.

[Simon-S14]

you do realise that a neo turbo is no laggier then a 2530?

[Harey]

No dont do this....it will be laggy as FCK! Terrible combination.

HKS 2530...should be able to pick up a s/h kit for ~$1500. A little pricey but its the best solution IMO for 200-220kw. Itll be the most responsive.

Oh, and dont forget cams gears.....20's LOVE them.

Yeah WTF, neo turbo is more responsive than a 2530. Neo turbo maxes out around 200rwkw whereas the 2530 can make 230rwkw.

[SimonR32]

Neo turbos on RB20's are not as great as you would think... They are in fact fairly laggy!

Either stick with just a normal R33 RB25 turbo or skip to a HKS 2530